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Nanometer TiO2 film taking expanded perlite as carrier and preparation method of film

A technology of expanded perlite and nanotechnology, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. It can solve the problem of uneven loading of nano-TiO2 particles, a large number of agglomerated blocks, and no expanded perlite package. Covering and other issues, to achieve the effect of dense distribution, good dispersion, high photocatalytic performance

Inactive Publication Date: 2014-07-23
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the expanded perlite used in the above-mentioned reference (3) Lu Fanghui's article is also a flaky expanded perlite, the loading of the nano-TiO2 particles therein is obviously uneven, and the expanded perlite is not completely coated, and there are a large number of Accumulated agglomerates appear

Method used

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  • Nanometer TiO2 film taking expanded perlite as carrier and preparation method of film
  • Nanometer TiO2 film taking expanded perlite as carrier and preparation method of film
  • Nanometer TiO2 film taking expanded perlite as carrier and preparation method of film

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Embodiment 1

[0024] Implementation 1: Raw material introduction: Expanded perlite comes from Langfang Xinzhong Filter Aid Co., Ltd., the main chemical composition and content are SiO 2 76.95%, Al 2 o 3 12.83%, Na 2 O 4.46%, K 2 O 3.07%, Fe 2 o 3 0.7%. Titanium oxysulfate is chemical grade, white powder, chemical formula TiOSO 4 2H 2 O, containing free H 2 SO 4 ≤8.0%, TiO 2 The content is not less than 38%. Urea is analytically pure, chemical formula (NH 2 ) 2 CO.

[0025] The preparation process steps are as follows:

[0026] (1) First prepare 0.1mol / L TiOSO 4 solution. Weigh TiOSO 4 Add 19.6g (0.1mol) of powder into 1000ml of hot water at a temperature of 40-60°C. Under rapid stirring, the solution gradually changes from milky white to clear, that is, TiOSO with a concentration of 0.1mol / L is prepared. 4 solution;

[0027] (2) Take 10g of expanded perlite and TiOSO with a concentration of 0.1mol / L 4 Solution 250ml, that is, mix according to the solid-liquid ratio of...

Embodiment 2

[0032] Example 2: Identical with raw material and process step in embodiment 1, difference is following process parameter: TiOS0 4 The concentration of the solution is 0.15mol / L, expanded perlite and TiOSO 4 The solid-to-liquid ratio of the solution is 1:25, TiOSO 4 : Urea=1:2 (molar ratio), the temperature in the hydrolysis precipitation reaction is 75°C and the time is 2h, the temperature in the calcination process is 500°C and the time is 2h.

Embodiment 3

[0033] Example 3: Identical with raw material and process step in embodiment 1, difference is following process parameter: TiOS0 4 The concentration of the solution is 0.15mol / L, expanded perlite and TiOSO 4 The solid-to-liquid ratio of the solution is 1:20, TiOSO 4 : Urea=1:1.5 (molar ratio), the temperature in the hydrolysis precipitation reaction is 80°C and the time is 2h, the temperature in the calcination process is 650°C and the time is 1h.

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Abstract

The invention discloses a nanometer TiO2 film taking expanded perlite as a carrier and a preparation method of the film. Anatase type TiO2 particles with the average particle size of 10-14 nm in the film are uniformly and densely distributed on the surface of the laminar expanded perlite without accumulation or agglomeration to form the nanometer TiO2 film which has a good loading effect, and is high in photocatalysis performance and convenient to recycle. The preparation method comprises the following steps: with TiOSO4 as a titanium source and urea as a precipitant, mixing the expanded perlite with a 0.1-0.2mol / L TiOSO4 solution according to the solid-to-liquid ratio of 1:(15-25) and adding the urea, wherein the mole ratio of TiOSO4 to the added urea is 1:(1.5-2); fully and uniformly stirring and heating at the temperature of 70-85 DEG C for 1-3 hours; carrying out a hydrolytic precipitation reaction; filtering and drying the precipitate product; and finally, calcining at the temperature of 450-650 DEG C for 1-3 hours. The preparation method has the advantages that the raw materials are readily available and low in price, the process flow is simple, special equipment is not needed, the productive investment is little and the industrial production is easily realized.

Description

Technical field [0001] The present invention involves a nano TIO with expansion perlite as the carrier 2 Film and preparation methods belong to TIO 2 In the field of photocatalytic technology and comprehensive utilization of non -metal mines, products are mainly used in related fields such as environmental pollutants. Background technique [0002] Nano TiO 2 It is a semiconductor photocatalytic material. Under the condition of light, the photochemical electron-flooring has a strong oxidation and reduction resistance. 2 Inorganic small molecules such as water can restore heavy metal ions as low -priced ions that are not toxic. It can degrade the exhaust of the car, sterilize and sterilize, and has been applied in many areas.However, in practical applications, due to nano TIO 2 The particles are larger than the surface area, and the surface is free and high. It is easy to reunite into secondary particles, which reduces its photocatalytic activity.Moreover, extremely fine particle s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/16B01J37/03C01F11/46
Inventor 郑水林徐春宏
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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